730d turbo(?) noise and lack of power

[LU223]

Hi Rick,

sorry to hear that you have trouble with your 730d. I have a 99 model and experienced only problems with the air flow sensor (LMM) which had to be replaced several times.
You are right by assuming that most problems should be recognized by the diagnostic tool.

I would check two other things:
First, does the engine get the right amount of air or is one of the air guides/spoilers blocked or not guiding the the air properly?
Second, the pressure of the fuel injection. I do not know if the the fuel injection is totally checked by the diagnosis system.
Third, the exhaust pipe system should be checked also since increased pressure in the system affects the power of the engine.

I can not imagine that the diesel sold at brand gas stations in Europe will have an impact on the engine. Perhaps with certain kinds of Biodiesel.

I do not know if I could be of help. But keep us posted, because any known source of problem can help somebody in the future.

Greetings to Brugge

Michael